post xml 通过 simplexml_load_string 解析问题

将如下$xml = "<?xml version='1.0' encoding='utf-8'?>

<address>
<street>Lot 11, Happy Street</street>
<state>Florida</state>
<country>USA</country>
</address>

";  post到服务器，服务器端通过simplexml_load_string解析，报

Warning:  simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : String not started expecting ' or " in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: <?xml version=\"1.0\" encoding=\"utf-8\"?> in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]:               ^ in C:\AppSer\.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : Malformed declaration expecting version in C:\AppSer\.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: <?xml version=\"1.0\" encoding=\"utf-8\"?> in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]:               ^ in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : Blank needed here in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: <?xml version=\"1.0\" encoding=\"utf-8\"?> in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]:               ^ in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : parsing XML declaration: '?>' expected in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]: <?xml version=\"1.0\" encoding=\"utf-8\"?> in C:\AppSer\process.php on line 14

Warning:  simplexml_load_string() [function.simplexml-load-string]:               ^ in C:\AppSer\process.php on line 14

错误。

通过最初的排查，我认为是因为字符被html格式化了,即通过

htmlspecialchars — Convert special characters to HTML entities方式。

所以我尝试，通过

htmlspecialchars_decode — Convert special HTML entities back to characters 

方式将其格式化回来。但错误依旧。

 通过google发现别的同志也遇到过这样的问题，分析出原因在于引号处理上。

通过

stripslashes — Un-quotes a quoted string

将post内容进行处理后。问题解决。